I picked up a Model A project and these calipers were in a box of parts. They look like they were gold plated at one time, but looks like it’s wore thin/pealed. I’m pretty sure they are motorcycle. Would be good for adapting to a multitude of projects. T-bucket type wire wheels? Drive shaft emergency brake? Go cart brakes? I can go on and on, but you get the idea. They had fluid still in them, so “probably” still good, but hell, rebuild them, it’s cheap. $20 for the pair. If you need shipping, they will fit in a flat rate box and ship on your dime.